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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a01436f85fcd656039b737d060a4434632420db0ad0f4b7e0a196e43ce193ce' 
  AND token = 'UT/95pgHvCtwMNRvBtH8JZNMcqdYwJIj7NLrdSjNp78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}